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# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
# http://www.apache.org/licenses/LICENSE-2.0
#
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from pathlib import Path
from urllib.parse import urlparse

import click
import yaml

from nat.data_models.config import Config


def validate_url(_ctx: click.Context, _param: click.Parameter, value: str) -> str:
    """Validate URL format for CLI options.

    Args:
        _ctx: Click context (unused, required by Click callback interface)
        _param: Click parameter (unused, required by Click callback interface)
        value: URL string to validate

    Returns:
        The validated URL string

    Raises:
        click.BadParameter: If URL is invalid or uses unsupported scheme
    """
    if not value:
        return value

    try:
        result = urlparse(value)
        if result.scheme not in ('http', 'https'):
            raise click.BadParameter('URL must use http:// or https:// scheme')
        if not result.netloc:
            raise click.BadParameter('URL must include a hostname')
        return value
    except click.BadParameter:
        raise
    except Exception as e:
        raise click.BadParameter(f'Invalid URL format: {e}')


def validate_config(config_file: Path) -> Config:
    """Validate configuration file and return parsed config"""
    try:
        from nat.runtime.loader import load_config

        # Load using the NAT loader functions. This performs validation
        config = load_config(config_file)

        return config

    except yaml.YAMLError as e:
        raise click.ClickException(f"Invalid YAML format: {str(e)}")
    except Exception as e:
        raise click.ClickException(f"Validation error: {str(e)}")
